Command line arguments with CLI11

[ravil-mobile]

Hi all,

I've been recently looking through the codebase and examine how we handle command line arguments. LLVM auxiliary tools are used for rocmlir-gen which results in a ton of global variables which, then, are populated throughout other functions.

CLI11 is a light-weight command line parser. As for me, it is elegant and easily distributed.

Here is a wat how one can fetch, install and link the library using only CMake

include(FetchContent)
FetchContent_Declare(
  cli11
  GIT_REPOSITORY https://github.com/CLIUtils/CLI11
  GIT_TAG        v2.2.0
)
FetchContent_MakeAvailable(cli11)

target_link_libraries(my_target PRIVATE CLI11::CLI11)

Here is a C++ example from my previous project.

#include "CLI/CLI.hpp"

int main(int argc, char *argv[]) {
  CLI::App app{"elementwise example with multi-dim block/grid"};

  size_t gridDim{3};
  app.add_option("--grid-dim", gridDim, "grid dimension (1,2 or 3)")->required();

  size_t blockDim{3};
  app.add_option("--block-dim", blockDim, "block dimension (1,2 or 3)")->required();

  bool verbose{false};
  app.add_flag("-v", verbose, "verbose");

  CLI11_PARSE(app, argc, argv);
  ...
}

I guess the only issue that we may face is the license.

What do you think?